What is CVE-2026-34890?

CVE-2026-34890 is a medium-severity vulnerability in Mark O’donnell Mstw League Manager, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2026-04-02.

How severe is CVE-2026-34890?

Medium severity. CVSS v3 base score is 6.5 out of 10.

XSS in Mark O’donnell Mstw League Manager

CVE-2026-34890

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Mark O’Donnell MSTW League Manager allows DOM-Based XSS.This issue affects MSTW League Manager: from n/a through 2.10.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (11.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L.

Affected products

Mark O’donnell Mstw League Manager — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

patchstack.com/database/wordpress/plugin/mstw-league-manager/vulnerability/word… (vdb-entry)

Frequently asked questions

What is CVE-2026-34890?: CVE-2026-34890 is a medium-severity vulnerability in Mark O’donnell Mstw League Manager, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2026-04-02.
How severe is CVE-2026-34890?: Medium severity. CVSS v3 base score is 6.5 out of 10.